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http://dx.doi.org/10.7776/ASK.2021.40.5.428

Verification of the feasibility of higher-order modulation for long-range communication in deep water  

Kim, Donghyeon (KIOST-KMOU OST School)
Kim, J.S. (Korea Maritime and Ocean University)
Hahn, Joo Young (Agency for Defense Development)
Publication Information
The Journal of the Acoustical Society of Korea / v.40, no.5, 2021 , pp. 428-438 More about this Journal
Abstract
For long-range communication in deep water, low carrier frequency is efficient due to a decrease in transmission loss. However, there is a limitation in that the data rate decreases due to a narrow bandwith. In order to increase the data rate in an environment with a limited bandwidth, it is necessary to design a higher-order modulation scheme. This paper analyzes the long-range communication data modulated by higher-order modulation schemes. The long-range communication experiment (23 km ~) was conducted in East Sea in October 2020. During the experiment, a vertical line array was utilized and communication sequences were modulated by Phase Shift Keying (PSK) and Quadrature Amplitude Modulation (QAM) schemes and transmitted by a towed source. In more detail, PSK modulation consists of quadrature PSK and 8PSK, QAM modulation consists of 8QAM and 16QAM. Time reversal processing is applied to mitigate inter-symbol interference by utilizing the correlation between received signals and channel impulse responses. All modulation schemes show successful results at 23 km range, demonstrating the feasibility of higher-order modulation in long-range communication.
Keywords
Deep water; Long-range communication; Time reversal processing; Higher-order modulation;
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